Fifteen solid birch slats sit under a 4" high-density foam mattress here, spreading weight across the frame and lifting its slat capacity to 490 lbs while the bed itself is rated for a 265 lb sleeper. Unfolded it measures 79" x 31.5" x 16"; folded it drops to 33" x 31" x 13" and rolls away on smooth casters, two of which lock. Rustproof metal tubing keeps the frame looking new, anti-falling bars and hook and loop fasteners hold the mattress in place, and anti-slip foot pads steady it in use. Straps secure the folded frame for storage in a closet or against a wall.